WO2019193814A1 - Procédé de communication de données, station de base centrale, et station terrestre - Google Patents

Procédé de communication de données, station de base centrale, et station terrestre Download PDF

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Publication number
WO2019193814A1
WO2019193814A1 PCT/JP2019/002031 JP2019002031W WO2019193814A1 WO 2019193814 A1 WO2019193814 A1 WO 2019193814A1 JP 2019002031 W JP2019002031 W JP 2019002031W WO 2019193814 A1 WO2019193814 A1 WO 2019193814A1
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WO
WIPO (PCT)
Prior art keywords
address
station
packet data
earth station
earth
Prior art date
Application number
PCT/JP2019/002031
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English (en)
Japanese (ja)
Inventor
多伸 福田
真木子 平木
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN201980023253.1A priority Critical patent/CN111937354B/zh
Priority to JP2020511610A priority patent/JP6847302B2/ja
Priority to US17/042,568 priority patent/US11665590B2/en
Priority to DE112019001794.2T priority patent/DE112019001794T5/de
Publication of WO2019193814A1 publication Critical patent/WO2019193814A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18517—Transmission equipment in earth stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/66—Layer 2 routing, e.g. in Ethernet based MAN's
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the satellite communication system includes a DAMA (Demand Assignment Multiple Access) system (for example, refer to Patent Document 3).
  • DAMA Demand Assignment Multiple Access
  • the control station assigns the earth station line, and a plurality of earth stations (transmitting stations or receiving stations) to which the line is assigned perform data communication (IP communication) via the satellite line. Is what you do.
  • IP communication data communication
  • the DAMA system performs line allocation when necessary. Since the DAMA method can be released and reassigned after use of the line, the traffic of the line can be secured. Because of these characteristics, satellite communication systems using the DAMA method have not been dependent on terrestrial circuits such as mobile phone lines even in an emergency or disaster. Has been.
  • a data communication method is a data communication method for performing packet data communication between a plurality of earth stations in the same subnet through a communication line via a satellite, wherein the L2 address of the transmission source is assigned to one earth station.
  • L2 address transmission step for transmitting to another earth station, and the other earth station associates the L2 address with the one earth station that has transmitted the L2 address of the transmission source, and stores it in the L2 address management table.
  • the address storage step and the destination L2 address are read from the destination packet data which is packet data including the destination L2 address, and the other earth station is addressed to the associated earth station by referring to the L2 address management table.
  • a data transmission step of transmitting packet data is a data communication method for performing packet data communication between a plurality of earth stations in the same subnet through a communication line via a satellite, wherein the L2 address of the transmission source is assigned to one earth station.
  • L2 address transmission step for transmitting to another earth station, and the other earth station associates the L2 address with the one
  • the earth station according to the present invention is one of a plurality of earth stations that perform packet data communication in the same subnet through a communication line via a satellite, and the other earth stations include the L2 address of the own station.
  • An L2 address storage unit that reads the L2 address of the transmission source from the transmission source packet data that is packet data, associates it with the other earth station that has transmitted the transmission source packet data, and stores it in the L2 address management table;
  • a transmission / reception unit that receives source packet data sent from the destination, reads the destination L2 address from the destination packet data, and refers to the L2 address management table to transmit the destination packet data to the associated earth station It is characterized by comprising.
  • the earth station according to the present invention is one of a plurality of earth stations that perform packet data communication in the same subnet through a communication line via a satellite, and is an L2 address of the own station, and is connected to the own station.
  • the source packet data that is the packet data including the L2 address of the communication terminal is transmitted to the other earth station, and the destination packet data that is the packet data including the destination L2 address is transmitted from the other earth station.
  • an L2 address confirmation unit that reads the destination L2 address from the destination packet data and discards the destination packet data when the destination L2 address is not the local station L2 address.
  • Embodiment 1 FIG.
  • a communication system, a communication method (data communication method), a HUB station, and a receiving station according to Embodiment 1 of the present invention will be described with reference to FIGS.
  • the same reference numerals denote the same or corresponding parts, and detailed descriptions thereof are omitted.
  • the communication system according to Embodiment 1 is suitable for a DAMA satellite communication system.
  • a DAMA satellite communication system will be described as an example.
  • the communication system according to the first embodiment includes a plurality of communication stations 1 including a HUB station 11 (hub station) and an earth station 12, a satellite 2 (satellite station 2), and a control station 3.
  • the communication terminals 4 (HUB station communication terminal 4a and communication terminal 4b) connected to the HUB station 11 and the earth station 12 may be included in the communication system according to the first embodiment.
  • Each earth station 12 performs packet data communication (transmission and reception of packet data) via the HUB station 11 using the communication line 5.
  • the HUB station 11 may be called a central station 11 or a relay station 11.
  • the earth station 12 can be said to be a transmitting station 12 and a receiving station 12 for packet data communication.
  • the HUB station 11 may function as the earth station 12 without functioning as the HUB. That is, the L2 address of the own station (L2 address of the communication terminal 4 connected to the own station) may be exchanged between the earth stations 12.
  • the earth station 12 may be the HUB station 11. In this case, another earth station 12 performs packet data communication via the HUB station 11 in the same subnet on the communication line 5.
  • the DAMA control unit 31 sends a request for line assignment of the satellite communication system from the communication station 1 using the control line 33 via the satellite 2 via the control line modem 32. receive.
  • the DAMA control unit 31 notifies the communication station 1 of the assigned communication line 5 via the control line 33.
  • Packet data communication via the HUB station 11 is performed between the earth stations 12 among the plurality of communication stations 1 that have received the line assignment.
  • the HUB station 11 transfers packet data communication to a plurality of earth stations 12 through the satellite 2 among the plurality of communication stations 1.
  • the control line 33 is also called a CSC line 33 because it is a line for which a communication line allocation request is made.
  • CSC stands for Common Signaling Channel.
  • the earth station 12 includes an earth station control unit 18 (earth station transmission / reception unit 18), an L2 address confirmation unit 19 (confirmation unit 19), a communication modem 20 (modem 20), a satellite GW 21 (satellite gateway 21), and an earth station control unit. 22 (Earth station 12 side).
  • the earth station control unit 22 controls the earth station control unit 18 (earth station transmission / reception unit 18) and the L2 address confirmation unit 19 (confirmation unit 19).
  • the earth station control unit 22 controls the operation as the communication station 1 (request for line assignment of the satellite communication system) and the operation as the earth station 12.
  • the functional block diagram of the communication system according to Embodiment 1 shown in FIG. 2 is a modification of the functional block shown in FIG. FIG. 2 illustrates a case where the communication station 1 has both the functions of the HUB station 11 (hub station) and the earth station 12. That is, in this case, the transmission / reception unit has the functions of the HUB station transmission / reception unit 13 and the earth station transmission / reception unit 18.
  • the communication modem has functions of the communication modem 15 and the communication modem 20.
  • the satellite GW (satellite gateway) has the functions of the satellite GW16 and the satellite GW21.
  • the communication station control unit (control unit) has the functions of the HUB station control unit 17 and the earth station control unit 22. As shown in FIG.
  • the L2 address storage unit 14 and the L2 address confirmation unit 19 may be integrated or separate.
  • the functions of the L2 address storage unit 14 and the L2 address confirmation unit 19 are separated from the functions from the satellite GW. That is, the L2 address storage unit 14 may be provided in the satellite GW 16 (satellite GW 21) that functions as a gateway to the communication line 5. Similarly, the L2 address confirmation unit 19 may be provided in the satellite GW 21 (satellite GW 16) that functions as a gateway to the communication line.
  • the HUB station 11 is for data communication in which packet communication is performed between a plurality of earth stations 12 in the same subnet (layer 2 network) through the communication line 5 via the satellite 2.
  • the L2 address storage unit 14 reads the L2 address of the transmission source from the transmission source packet data that is the packet data including the L2 address of the local station 12 and associates it with the earth station 12 that has transmitted the transmission source packet data. And stored in the L2 address management table 141.
  • the transmission source packet data is packet data that triggers a storage operation (L2 address storage step) of the L2 address storage unit 14. This can be said that the HUB station 11 is learning the L2 address of the earth station 12 (communication terminal 4b).
  • the L2 address of the earth station 12 is the L2 address of the communication terminal 4b connected to the earth station 12. Therefore, when the communication terminal 4b connected to the earth station 12 is changed to another terminal, the L2 address of the earth terminal 12 is changed because the L2 address of the communication terminal 4b is changed. Furthermore, when there are a plurality of communication terminals 4b connected to the earth station 12, there are a plurality of L2 addresses.
  • the HUB station transmitting / receiving unit 13 receives the source packet data transmitted from the earth station 12, reads the destination L2 address from the destination packet data, refers to the L2 address management table 141, and associates the earth
  • the destination packet data is transmitted to the station 12.
  • the destination packet data is packet data that triggers a transmission operation (L2 address transmission step) of the HUB station transmission / reception unit 13.
  • the destination L2 address is also the L2 address of the communication terminal 4 b connected to the earth station 12. Therefore, since the L2 address of the communication terminal 4b changes, the L2 address of the earth station 12 also changes. Furthermore, when there are a plurality of communication terminals 4b connected to the earth station 12, there are a plurality of L2 addresses.
  • the earth station 12 is one of a plurality of earth stations 12 that perform packet communication via the HUB station 11 in the same subnet (layer 2 network) via the communication line 5 via the satellite 2.
  • the plurality of earth stations 12 (transmitting station 12 and receiving station 12) are composed of n units of earth station 121, earth station 122,..., Earth station 12n-1, and earth station 12n.
  • the earth station control unit 18 is connected to the communication terminal 4 (communication terminal 4b).
  • the earth station control unit 18 includes a communication modem 20 (modem 20) and a satellite GW 21 (satellite gateway 21).
  • the communication modem 20 (modem 20) is connected to the antenna unit of the earth station 12, and passes packet data (source packet data, destination packet data) via the communication line 5 (satellite line 5) and the HUB station 11. ).
  • a communication line 5 (satellite line 5) indicated by a one-dot chain line is a line assigned between the HUB station 11 and the earth station 121.
  • a communication line 5 (satellite line 5) indicated by a two-dot chain line is a line assigned between the HUB station 11 and the earth station 122.
  • a communication line 5 (satellite line 5) indicated by a broken line is a line assigned between the HUB station 11 and the earth station 123.
  • the function of the L2 address confirmation unit 19 is illustrated separately from the function of the satellite GW 21 as in FIG. That is, the L2 address confirmation unit 19 may be provided in the satellite GW 21 that functions as a gateway to the communication line.
  • the broken lines shown in FIG. 5 indicate the bidirectional flow of communication data (packet data) between the three units of the earth station 121, the earth station 122, and the earth station 123 and the HUB station 11.
  • the HUB station transmitting / receiving unit 13 receives the source L2 address (source packet data) in the initial communication after the establishment of the communication line 5. If the L2 address transmission step is performed in the initial communication after the establishment of the communication line 5, the transmission of unnecessary packet data can be reduced immediately after the establishment of the communication line 5, but the initial communication is performed in consideration of the number of earth stations 12. Alternatively, the number of earth stations 12 that perform the L2 address transmission step may be reduced. As described above, the L2 address transmission step may be performed together in communication for transmitting packet data to another earth station 12.
  • a reception step in which the earth station 12 receives the destination packet data may be added after the data transmission step.
  • the destination station packet data sent from the HUB station 11 is received by the earth station transceiver unit 18, and the L2 address confirmation unit 19 reads the destination L2 address and discards it when it is not for the local station.
  • the reception step is performed on the assumption that there are a plurality of L2 addresses of the own station.
  • the one that has performed the L2 address transmission step does not transmit (transfer) packet data (destination packet data) other than addressed to itself from the HUB station 11, so the function of the L2 address confirmation unit 19 May be stopped.
  • the data reception step stops the determination of discarding the destination packet data by reading the destination L2 address from the destination packet data after the L2 address transmission step.
  • the L2 address confirmation unit 19 reads destination packet data by reading the destination L2 address from the destination packet data received by the earth station transceiver unit 18. The decision to discard will be stopped.
  • the stop of determination includes both the case where reading of the destination L2 address itself is stopped and the case where the destination L2 address is read but not discarded.
  • the earth station 12 may be discarded. That is, the data reception step can be performed without the L2 address confirmation unit 19.
  • the L2 address storage unit 14 reads the L2 address of the transmission source from the transmission source packet data that is the packet data including the L2 address of the local station 12 and transmits the transmission source packet data. 12 and stored in the L2 address management table.
  • the transmission / reception unit 13 receives the source packet data sent from the other earth station 12, reads the destination L2 address from the destination packet data, refers to the L2 address management table 141, and associates the earth The destination packet data is transmitted to the station 12.
  • the data communication method according to Embodiment 1 may include not only the data reception step but also the above-described line allocation step. Further, the data communication method according to Embodiment 1 may include only the line allocation step without including the data reception step. It has been described that when the communication terminal 4b connected to the earth station 12 is changed to another terminal, the L2 address of the earth station 12 is changed because the L2 address of the communication terminal 4b is changed. This will be described in the second embodiment. This can be said that the HUB station 11 is relearning the L2 address of the earth station 12 (communication terminal 4b). However, also in the data communication method according to the second embodiment, the relationship between the line assignment step and the data reception step is the same as that of the data communication method according to the first embodiment.
  • FIG. 6 is an illustration of the relationship between the HUB station 11 that omits the communication line 5 and performs packet data communication with a plurality of earth stations 12.
  • the satellite GW 16 of the HUB station 11 manages the L2 address management table 141 and has a function of transferring packet data to the modem 15 in the HUB station 11 in accordance with the contents.
  • the L2 address management table 141 the L2 address that is the destination of the destination packet data obtained from the source packet data and the earth station 12 (earth station 121, earth station 122) in which the communication terminal 4b having the L2 address is installed. , Earth station 123) is written.
  • ⁇ L2 address management table 1> in the initial state, nothing is registered. Therefore, as shown in FIG.
  • FIG. 6 shows a state in which packet data is transferred from the communication terminal 4b connected to the earth station 121 and the satellite GW 16 on the HUB station 11 side is learning.
  • the earth station is an example of ⁇ L2 address management table 2>. Since 121 is associated, it is not necessary to transmit packet data to all the earth stations 12.
  • the satellite GW 16 of the HUB station 11 reads the destination L2 address from the packet data and searches the L2 address management table 141 for the destination L2 address.
  • the packet data is transferred only to the earth station 12, and is not transferred to other earth stations 12. If the correspondence between the destination L2 address and the earth station 12 is not registered in the L2 address management table 141, the packet data is transferred to all the earth stations 12 connected to the communication line 5 at that time.
  • Embodiment 2 a data communication method, a HUB station, and an earth station according to Embodiment 2 of the present invention will be described with reference to FIG.
  • the satellite GW 16 (L2 address storage unit 14) of the HUB station 11 manages the L2 address management table 141.
  • the L2 address management table 1411 the L2 address of the destination earth station 12 is written, and in the initial state, no earth station 12 is registered.
  • description will be made mainly on the configuration of the functional block diagram shown in FIG. 1, but the data communication method, the HUB station, and the earth station according to the second embodiment are shown in the functional block diagram and FIG. The configuration of the functional block diagram shown in FIG.
  • the HUB station 11 relearns the L2 address of the earth station 12 (communication terminal 4b).
  • the first and second embodiments are basically the same.
  • the communication terminal 4b connected to the earth station 12 is changed to another terminal and the response when the L2 address of the communication terminal 4b is changed is described.
  • FIG. 7 shows a state in which packet data is transferred from the communication terminal 4b connected to the earth station 122 and the satellite GW 16 on the HUB station 11 side is relearning.
  • the source L2 address written in the packet data is read, and the corresponding earth station 12 is read in the L2 address management table 141.
  • registration is performed. That is, the previously registered earth station 121 is deleted and the earth station 122 is registered.
  • the operations other than the deletion operation are basically the same as the operations of the L2 address storage unit 14 (L2 address storage step) in the satellite GW 16 described in the first embodiment.
  • the earth station is an example of ⁇ L2 address management table 3>. Since 122 is associated, packet data need not be transmitted to all earth stations 12.
  • the satellite GW 16 of the HUB station 11 reads the destination L2 address from the packet data and searches the L2 address management table 141 for the destination L2 address.
  • the packet data is transferred only to the earth station 12, and is not transferred to other earth stations 12. If the correspondence between the destination L2 address and the earth station 12 is not registered in the L2 address management table 141, the packet data is transferred to all the earth stations 12 connected to the communication line 5 at that time.
  • the L2 address confirmation unit 19 not only determines whether to discard the destination packet data by using the changed L2 address as the L2 address of the local station.
  • the following operation may be performed.
  • the L2 address confirming unit 19 transmits the source packet data including the changed L2 address as the L2 address of the local station to the HUB station 11 after the earth station transmitting / receiving unit 18 transmits the destination L2 address from the destination packet data.
  • the determination of discarding destination packet data by reading may be stopped.
  • the cancellation of the discard determination is the same as that described in the first embodiment.
  • the data communication method, the HUB station, and the earth station according to the second embodiment are simply the case where the communication terminal 4b is removed. However, it can be handled as follows.
  • the satellite GW 21 in the earth station 12 sends packet data indicating the removed L2 address to the HUB through the communication line 5 via the modem 20. Transfer to the station 11 side.
  • the L2 address of the communication terminal 4b is described as the source L2 address.
  • the communication terminal 4b has been removed from the registered earth station 121. Even if packet data addressed to the earth station 121 (specifically, addressed to the communication terminal 4b connected to the earth station 121) is transmitted from the HUB station 11 or transmitted via the HUB station 11, the HUB station 11 is not connected to the earth station 121. Since the fact that the communication terminal 4b has been removed from the earth station 121 is registered from the information of the L2 address of the HUB station 11, the HUB station transmission / reception unit of the HUB station 11 is transmitted without transmitting packet data to all the earth stations 12. 13 discards.
  • packet data may be transmitted to notify the earth station 122 and the earth station 123 other than the earth station 121 that the communication terminal 4b has been removed from the earth station 121. This notification may be triggered by the fact that the communication terminal 4b has been removed from the earth station 121.
  • the data communication method, the HUB station, and the earth station according to the second embodiment are similar to those in the first embodiment even when the earth station 12 to which the communication terminal 4b is connected is changed.
  • the amount of transfer to the line 5 can be suppressed, and the utilization efficiency of the satellite line 5 can be increased.
  • the L2 address confirmation unit 19 (reception step) transmits the source packet data to the HUB station 11 or the earth station 12
  • the destination packet is obtained by reading the destination L2 address from the destination packet data.
  • An operation for stopping the determination of discarding data, and an operation for determining whether to discard the destination packet data with the changed L2 address as the L2 address of the local station when the communication terminal 4b connected to the local station is changed Only one of these may be performed.
  • the data communication method, the HUB station, and the earth station according to the first and second embodiments are opposed to each other when the communication terminals in the same subnet (layer 2 network) perform packet data communication via the satellite line.
  • the satellite link often has a smaller communication bandwidth than the communication link in the ground facilities, and the packet data is always transferred to the earth station, which is an opposite station that does not need to receive the packet data.
  • the pressure can be suppressed.
  • packet data transfer to the earth station, which is an opposite station that does not require reception can be suppressed to a minimum, and the satellite channel band can be effectively used.
  • HUB station transceiver (transceiver, HUB station transceiver, transceiver) ), 14... L2 address storage unit (storage unit, L2 address storage device, storage device), 141... L2 address management table, 15 .. Modem for communication (modem), 16 .. Satellite GW (satellite gateway), 17.
  • Earth station transmitter / receiver transmitter / receiver, earth station transmitter / receiver, transmitter / receiver, 18a ⁇ Control station controller (control station controller, controller), 19 ⁇ L2 address checker (checker, L2 address checker) , Confirmation machine, L2 address confirmation device, confirmation device), 20 ... modem for communication (modem), 21 ... satellite GW (satellite gateway), 22 ... earth station control unit (communication station control unit, control unit, earth Station control device, communication station control device, control device, communication station controller, earth station controller).

Abstract

L'invention concerne une station terrestre qui transmet une adresse L2 d'une source de transmission à une autre station terrestre (ou station CENTRALE), l'autre station terrestre (ou station CENTRALE) met en corrélation la station terrestre qui a transmis l'adresse L2 de la source de transmission avec l'adresse L2 et stocke l'adresse L2 dans une table de gestion d'adresse L2, lit l'adresse L2 d'une destination provenant de données de paquet de destination, qui sont des données de paquet contenant l'adresse L2 de la destination, et l'autre station terrestre (ou station CENTRALE) se réfère à la table de gestion d'adresse L2 et transmet les données de paquet de destination à la station terrestre corrélée.
PCT/JP2019/002031 2018-04-04 2019-01-23 Procédé de communication de données, station de base centrale, et station terrestre WO2019193814A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201980023253.1A CN111937354B (zh) 2018-04-04 2019-01-23 数据通信方法、hub站和地球站
JP2020511610A JP6847302B2 (ja) 2018-04-04 2019-01-23 データ通信方法、ｈｕｂ局及び地球局
US17/042,568 US11665590B2 (en) 2018-04-04 2019-01-23 Data communication method, hub station, and earth station
DE112019001794.2T DE112019001794T5 (de) 2018-04-04 2019-01-23 Datenkommunikationsverfahren, hub-station und bodenstation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018072492 2018-04-04
JP2018-072492 2018-04-04

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WO2019193814A1 true WO2019193814A1 (fr) 2019-10-10

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US (1) US11665590B2 (fr)
JP (1) JP6847302B2 (fr)
CN (1) CN111937354B (fr)
DE (1) DE112019001794T5 (fr)
WO (1) WO2019193814A1 (fr)

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CN111937354A (zh) 2020-11-13
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US11665590B2 (en) 2023-05-30
JP6847302B2 (ja) 2021-03-24
US20210144586A1 (en) 2021-05-13
CN111937354B (zh) 2022-04-01

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